Rotary pump



A. V. JENSEN April 16, 1929.

ROTARY PUMP F i led March 24, 1927 3 Sheets-Sheet l 6, 1929. A; v.JENSEN ROTARY PUMP Filed-Marchj April 1 5 Sheet s-Sheet 2 T zzzrefi 0'2?gig/7205 Vrizerv/zae/z April 16, 1929. A, v, JENSEN 1,709,580

ROTARY PUMP Fled March 24, 1927 5 Sheets-Sheet 5 2 25 /0 20 55* 4Patented Apr. 16,

UNITED STATES g 1,709,580 PATENT OFFICE.

AMOS VERNEB JENSEN, OI CEDAR FALLS, IOWA, AS OIGNOR TO THE VIKING PUMICOMPANY, A CORPORATION OF IOWA.

ROTARY PUMP.

Application filed March 24, 1827, Serial No. 177,912.

This invention relates to rotary pumps and is particularly adaptable tosuch pumps when used in the paper making industry for pumping orhandling pulp in solution such as paper and wood pulp, or in otherindustries where it is desired to handle by means of a pump, a fluidhaving a consistency similar to pulp or the like. A

Heretofore in attempting to handle pulp or the like by the use of rotarypumps, it has been discovered that the pulp fibers orthe like tend toaccumulate and wad or ball up in pockets or depressions'in the pump,thuscaus- ,ing the pump eventually to jam, and resultpump.

ing in delay and loss of time while the pump is being cleared. It hasbeen discovered also thatlthe pulp tends to work into the bearings,thereby causing sticking and heating, and possible scoring or freezingof the bearings.

The present invention is intended to provide a novel construction andarrangementof element s whereby the above and certain otherobjectionable results are overcome, and wherein a system of novelconstruction and arrangement is employed for conducting a fluid such aswater, used in the present'1n stance in a pulp pump, to and throughvarious partsof the pump to keep the pump free from i the accumulationof pulp fibers, which, if permitted to wad orball up in the pump andcollect on the rotating parts, would seriously interferewith theeflicient operation of the pump.

' One of the objects of the inventionis to provide a casing whereinobjectionable pockets or depressions in which the pulp may collect andwad up are entirely eliminated, and wherein the inlet and outlet portsare so positioned, and certain portions of the'casing adjacent the saidports are so arranged as toco-operate with the peripheral edges of therotor teeth or vanes to produce a cutting or shearing action on the pulvide means for insuring'the removal of pulp from adjacent the sealmgportions or abutments formed in the head plate intermediate the inletand outlet ports.

Another object of the invention is to provide a novel construction andarrangement for keeping the bearings of the idler pinion and rotor shaftfree from the accumulation of pulp, thereby bearings.

Another object of the invention is to pro vide a construction andarrangement for effectually washing the sealing faces of the idler teethfree of pulp just before passing into co-operative relationship with thesealing abutments.

Another object of the invention is to provide means for flushing out theinterior of the preventing heating of the ,pump, and also the casing atthe rear of the rotor, in case the pump is to be shut down for anappreciable length of time, or in the event that the pump may have beenoperated during a temporary shortage of water supply. 7 Another objectof the invention is to provide a novel construction and arrangementwhereby the pulp is continually forced back into the interior .of thepump, thus preventing the passage of pulp to the rear of the rotor andits subsequent passage and loss through the drain or flush-out hole atthe rear of the casing. j p A further object of the invention is torelieve excessive friction at the hub of the rotor due to possible endthrust on the rotor tending to force it rearwardly in the casing.

A still further object of the invention is toimprove devices of thischaracter in sundry details hereinafter described and particular- 1ypointed out in the appended claims.

One embodiment of the invention is shown for illustrative purposes inthe accompanying drawings, in which Fig. 1 is a front elevation of apump illustrating the embodiment of certain features of the invention.

Fig. 2 is a front elevation, partly in section, of the pump shown inFig. 1, with the head plate removed to show the interior of the pump andthe relative'position of the rotor, idler pinion and crescent partition,and. to illustrate certain other features of the inven tion. the viewbeing taken substantially on the line 2-2 of Fig. 3. i

Fig. 3 is a vertical sectional, elevational view taken as indicated bythe line 33 of Fig. 1 and showing additional features of the front. end

removable ead plate 15 secured to the casing Referring to the drawings,

invention. I l

Fig; 4 is' 'a fragmentary elevational view of' the inner face of thehead plate taken as in dicated by the line 44 of Fig. 3,

Fig. 5 is an enlarged transverse sectional elevation through the rotorshaft and associated parts including its bearing sleeve, the view beingtaken as indicated by the line 55 of Fig.3.

Fig. 6 is an enlarged fragmentary sectional elevational view taken onthe line 6-6 of Fig. 1 illustrating the construction ofthe sprayarrangement for removing the pulp from adj acent the sealing portions orabutments formed in the head plate intermediate theinlet and outletorts.

Fig. 7 is a si e elevational View of the rotor.

Fig. 8 is a front elevation of the pump shown in Fig. 1 illustratingdiagrammatically a system of pipes or tubing for conducting a suitablefluid, such as water, in the present instance, to the various parts ofthe pump for keepin the pulp passages and bearings of the pump ree fromthe accumulation of pulp, thereby contributingv materially to ,theefiicient operation of the pump.

the type of rotary pump shown, and containing an illustrative embodimentof the invention, coinprises a cylindrical casing 10 having an annularwall portion 11 and a back or rear wall portion 12, the annular wallportion being 1 provided with inlet and outlet ports 1;} and 14,respectively.

The casing 10 is dprovidedwith an open ortion a apted to be closed by abymeans of the studs 16 and nuts 17. R0-

tatably mounted concentrically within the annular wall portion 11 is aninternally toothed rotor 18 provided with teeth or vanes 19 adapted tomesh with external teeth 20 on idler pinion 21 rotatably mounted on anidler pin 22 rigidly supported'in the head plate 15, and positionedeccntrically with respect to the rotor 18. The rotor 18 issecured-toan'd'adapted to be driven by a shaft suitable source of powersupply and rotata 1y mounted-in a bearing sleeve 24, thesaid sleevebeing rigidly secured to the rear wall 12 of the casing 10 in a mannerto form in effect, a. part of said casing. In the construction shown,the head plate 15 is providedwith an integrally formed crescent shapedpartition 25 having its outer convex face 26 concentric .with the innerfaces of I the teeth or vanes; 19 of the rotor, and its inner concaveface concentric with the outer faces of the teeth 20 ofthe idler pinion21 and adapted to occupy a position within the casing betweentheinneifaces of the rotor teeth and the'outer faces of the pinion-teethand in the space formed by reason of the relative concentric andeccentric mounting of the rotor and idler pinion, respectively. The headplate 15 is also provided intermediate the inlet and outlet ports withrela-' tively large and small abutments 27 and 28,

respectivel the said abutments being so positioned' with-respect to thefront face of the rotor 18 as to provide a space between the ship withthe rotor 18 and idler pinion2l, ,the.lowermost stud, designated by thenumeral 16,for securing the head plate tothe casing, is offset from theuniform spacing of the remaining studs, it being obvious that by such anarrangement, there is but one position of the head plate 15 with respectto the casing 10 where the openings in the head plate will register withthe studs 16 and the stud16 mounted on the casing, thereby insuring,with absolute certainty, the proper positioning within the casing of thecrescentshaped partition 25 and sealing abutments 27 and 28 carried bythe head plate 15.

Referring to Fig. 2 of the drawing, it will be noted that with the rotor18 and idler pinion 21 being driven in the direction indicated by thearrows, the pulp or other similar fluid will be drawn into the casingthrough the inlet port 13 and into the interdental spaces of the rotor18 and idler pinion 21, which will carry itpast the crescent partition25 to the outlet port 14 where it will be discharged by reason of theteeth 20 of the pinion entering the, interdental spaces of the rotor,thereby forcing the. pulp and liquid radially outwardly between theteeth or vanes 19 of the rotor and into the outlet port.

The pump as thus far described is-well known, and further description ofthe par- 171011181 type of pump is deemed unnecessary.

As heretofore stated, some difiiculties have arisen in the use. of thistype of pump in handling wood or paper-pulp and the like, in that thetpeulp fibers in time gradually work into the arings', causing them toheat and stick, and, due to the pressure created in the pump, the pulphas a'tendency to work past the rotor into the space betweenthe rotorand the rear wall of the casing and intothe bearing a of the rotorshaft, in which case, difliculties are encountered, and if the pumisprovided with a drain .throughwhich t e .pulp and fluid between therotor and rear wall of the casing may escape, considerable loss of pulpwill result. 1

Furthermore, has been ndted that the pulp fibers have atendency todollect and wa'd or ball up in any depressions formed within the pumpcasing and particularly in the relief pockets formed in the head 15adjacent the edges of the sealing abutments 27 and 28.

To overcome these and other difficulties encountered in the use of thistype of pump in handling pulp and other fluids of similar.

consistency, the present invention contemplates the use of a novelconstruction and arrangement whereby properly directed streams or jetsof water areeniployed for keeping the bearings and rehef pockets freefrom the accumulation of pulp fibers, the streams or jets ion-. 21 isprovided with a bronze cased rubber bushing 29 rotatably mounted on thebronze cased idler pin '22 mounted rigidly .in the head plate 15. Tokeep the idler pinion bearing free from the accumulation of pulp and toforce back into the interior of the pump any pulp which might have atendency to work toward the bearing, the idler pin 22 is provided with acentrally disposed longitudinally extending opening 30 adaptedto receiveat its outer end the pipe or tubing 31 through which a stream of waterunder pressure may be injected into the interior of the idler pin. Theinner end of the idler pin 22 terminates a substantial distance short ofthe front face of the rotor 18 and the idler plate- 32 positioned withinthe opening formed inthe idler, pinion 21, thereby forming a pocket ordistributor head or chamber between the inner end of the pin 22 and theidler plate 32. The pin 22 may be provided also with radially extendinggrooves 33 "adapted to facilitate the discharge of the water from theopening 30 into the said chamber. The rubber bushing 29 is provided,

on its inner face, with a spirally formed groove 34, shown 1n thepresent instance, as of left hand construction, adapted to communicateat its inner end with the chamber formed between the end of the idlerpin-22' and idler plate '32, and at its outer or opposite end with apair of water passages or slots 35 formalin the inner face of the headplate adjacent the idler pin 22 and extending outwardly therefrom beyondthe outer face of the bronze encased rubber bushing 29. The end orsealing faces of the teeth of the idler pinion 21 adjacent the abutments27- and 28 are adapted to co-operate with said abutments to form a sealbetween the inlet and outlet ports 13 and 14, and are each provided withradially extending grooves or .slots 36 adapted to communicate at theirinner ends at intervals in the course of rota 'tionof the idler pinion21 with the water passages or slots formed in the head plate 15,

and at their outer ends with the interior of the pump. It will beobserved from the foregoing description that the water under pressurefrom the pipe 31 will be forced through the opening 30 in the idler pin22 and discharged at theinner end of the pin into the distributor heador chamber formed. at the lnner end thereof, thence through the spirallyformed groove 34 of the idler bushing 29-int0 the passages or slots 35formed in the head plate 15, and thence outwardly through the grooves orslots 36 formed 1n the end sealing face of the idler teeth- 21. thusforcing back into the interior of the pump any pulp fibers or the likewhich might otherwise work into the idler pinion bearing and interferewith the operation of the pump. This course and action of the water alsokeeps the bearing free from the accumulation of pulp fibers, and washesthe sealing faces of the teeth 20 of the idler pinion 21 free from pulpat intervals during the rotation of the pinion, the

passages or slots 35 being so positioned in the head plate that thesealing faces of the idler pinion teeth will be washed free'of pulp,

just before passing into co-operation with the sealing abutments 27 and28, thereby presenting a clean face of the idler teeth to the abutnientsfor co-operation therewith to pro vide an efi'ectual seal between theinlet and outlet ports. i

To prevent the escape or passage of pulp from the interior of the pumprearwardly pa st the rotor 18, and into the space between the-rotor andthe rear wall 12 of the casing, the outer annular face of the rotor ispr vi'ded with spaced apart annular grooves or channels 37 and 38connected together by means of-a spirally formed groove or chan nel 39shown, in the presentinstance, as of left hand construction, the annulargroove or channel 38 being providedtvith a plurality oflateral groovesor channels 40 extending longitudinally of the rotor toward the interiorof the pump and positioned around the annular face of the rotorintern'iediate the teeth or vanes 19 thereof.

The annular Wall 11 of the casing 10, ad-

jacent the annular grooves 37 and 38, and" spiral groove 39 formed intheface of the and thence through the lateral grooves 40 intothe'interior of the pump, thereby preventing the passage of pulp tatherear of the rotor.

If by' any chance, the pulp fibers should under pressure from the pipe48 suitably compressing t fixed bushing ,42 of the 7 right handformation tating, as indicated by vided around the shaft 23 within the42 rigidly mountei therein in a manner to receive the rotor shaft 23.Surrounding the rotor. shaft within the bearing sleeve 24 and adjacentthe outer end of the bushing 42 is an annular distributor head 43,provided on its outer periphery with an annular groove 44 and on its.inner face adjacent the shaft 23 with an enlarged opening 45, the saidgroove and enlarged opening being connected by] means of a pluralityofradially disposed annularly spaced ports 46 formed in the distributorhead. Co1nmunicating with the annular peripheral groove of thedistributor head is a radially disposed port 47 formed in-the bearingsleeve 24 and ada ted to receive at its outer end a water supp y pipeortube 48. The bushing 42 is provided on its inner face adjacent the rotorshaft 23 with a spirally formed'groove 49, shown, in the pflesentinstance, as of right hand construction, and communicating at its outerendwith the enlarged opening of'the distributor head 43 and at itsopposite or inner end with a. radially extending slot or groove formedin the bearing sleeve 24 where the latter terminates within the rearwall of the pump casing. It will he observed from the foregoingdescription that water will be forced into the distributorheadsurrounding a shaft 23 and through the annular groove49 in the bushing42, and thence out through the radially disposed slot or groove 50 intothe space" between the rear of the rotor and the rear wall 12 of thepump casing, from which it may be drained by means of-a pipe 51,thereby.pre-' venting the entranoegof pulp into the bearing of the rotorshaft. To prevent the escape of water from therearor outer end ofthebearing sleeve 24, suitable packing may be probear ng sleeve and apacking land 52 provided for epacking by means of nuts 53 in screwthreaded engagement with. studs 54 mounted in,the end of'the bearingsleeve.

It will be. noted that the groove 49 in the rotor shaft 23 is of andthat the shaft in rothe arrow in Fig. 3, will tend to carry thewaterfrom the pipe 4 8 in-' wardly toward the discharge end pf the groovewithin the casing, while the groove 34 i of thejrotatable idler pinionbushing 29 as well as the spiral groove 39 formed on the peduring a V--holes or openings their end portionsin the pockets 55 and 56 resriphery of the rotor 18 for connecting the annular grooves 37 and 38isof left hand formation,'this being being rotated, as indicated by thearrow in Fig. 3, and the idler pinion and its bushing being rotated inthe same direction, will cause the water from the pipes or tubes 31 and41 to be forced through the respective grooves and channels, with whichthey are in comnnmication, toward the interior of. the pump where thewater, together with the pulp from the inlet port 13, may be passed bythe teeth of the rotor 18 and ldler pinion 21 through the pump casingpast the crescent partition 25 to the outlet or discharge port 14.

It will be understood, of course, that in the event'that the rotor,rotor shaft and idler pinionwere rotated in the opposite direction, the

due to the fact that the rotor spiral formation of the respectivegrooves 7 would be reversed. (J I,

To prevent the accumulation and Wadding or balling up of the pulp fibersinithe portion of the relief ockets formed in the head 15 adjacent the autments 27 and 28, the head is provided, adjacent the edges of saidabutments, with a pluralit of' radially disposed pockets 55 and 56,havmg'lateralopenings:57 adapted to receivewater supply pipes 58 and 59,the pipes 58 being adapted to supply water under pressure edges of thelarger 59 to supply water to adjacent the edges of the smaller abutment281 Formed in the head plate adjacent the abutments 27 and 28are aseries of spray 60 terminating at one of the pockets 55 and 56 and attheir opposite end rtions "within the relief pockets formed in t e innerface of the plate 15. .It will be observed from the foregoingdescription that water under pressure from the pipes or tubes 58 and 59will enter ectively, the said pockets serving as headers of the water tothe pray holes 60, where it is forced into the relief pockets formed inthe head, thereby keeping the said relief pockets free from theaccumulation of pulp fiber, and keeping 'the pulp at these pointsagitated-in a manner to be easily handled vby the teeth of the rotor 18andthe idler pinion 21, T

To prevent the wedging of pulp tibersbetween the ripheral faces 19 andthe inner face of the annular wall portion 1,1,of the ca ing, it will benoted by reference to Fig. 2 t at the sides of the inlet and outletports 13 and 14, where the teethr19 of r the rotor 18 come into-co-operative relationship with the inner ,face of the annular wal 11,are formed with sharp edges as indicate at operation with the peripheraledges of the rotor teeth or vanes 19, a-cutting or shearmg actionforsevering any pulp fibers which may 5f the rotor teeth X in said figure,thereby producing, in 00- be caught betweenthe edges of the rotor teethand the. edge portion'of the inlet and ports at these'points.

The head plate 15 is .prdvided with suitably positioned flush-outopenings 61 normally closed by means of plugs 62, and if it should bedesired to flush out the interior of the pump when the latter is to beshut down for any considerable length of time, the plugs 62 may beremoved and suitable pipe connections 63, one of which is shown .indotted lines in Fig. 3, may be inserted in the flush-out openings 61,through which water under pressure. may be injected into the pump forthoroughly washing out any pulp fibers that may have adhered to theinterior thereof or to any of the parts of the rotor 18 oridlerpinion21. Should it be desired at such a time to flush out also the rearportion of the pumpcasing between the rotor 18 and the rear wall 12, thewall 12 is )IOVldBCl with a flush-out opening 64 in whic may-be inserteda water supply pipe65 through which a stream of water may e injectedintothe rear portion of, the easing and drained therefrom by the pipe51.

- Q If it should be found, in'the operation of the pump,thatthere-is atendency of the rotor to thrust rearwardl in the casing, due to pressurecreated in t 1e interior of the pump,- thereby producing excessivefriction between the hub of the rotor and the inner end of the bearingsleeve 24, the opening 64 in the rear wall 12, and the hole in which thedrain pipe 51 is normally mounted, maybe closed by means of plugs 66indicated, by dotted lines in Fig. 3, therebypermitting the spacebetween the rotor 18 and the rear wall 12 of the casing to fill withwater from the pipe 48 side of the rotor to offset or counter-balancethe pressure exerted on the rotor from the opposite side thereof or inthe interior of the pump, and by so doing relievethefriction' be tweenthe hub of the rotor and the inner end of the bearing sleeve 24. Thepressure set up in the space between the rotor and the rear of the pumpwith water for keeping the bearin'gs and other parts of the pump freefrom the accumulation of pulp fibers and for forcing the fibers towardthe interior of the pump. In the arrangement shown, a main supply pipe67 is provided, having one of its ends connected with a suitable sourceof water supply under pressure, and at its opposite end outlet tage invariously with a header 68 having suitable connections with the pipes48, 41, 59, 31 and 58 for conveying water to the various parts of thepump for the purposes heretofore described. Fig.

8 also shows a pulp supply pipe 69 connected with the inlet port 13 anda pipe 70 connected to the outlet ort 14 for the dispositionef the pulpin any esired manner.

The use of rubber or resilient bushings in the bearings of the rotorshaft and idler pinion as above described, has been found to be ofmaterial advantage in that in the event of any foreign matter enteringthe bushing by reason of the pump being operated during tem oraryfailure of water supply or because of t e presence of foreign matterinthe water supply itself, the bushing, by reason of its resiliency, mayyield sufiiciently to prevent the heating or scorin of any of therotating parts, and also to enable such foreign matter to eventuallyfree itself and be carried out of the pump byway of the water channelsand grooves associated with the bearings of the rotor and idler pinionand other parts of the pump.

Itwill be observed from the description contained in the foregoingspecification, that the present invention provides a novel constructionand arrangement of elements for severing any pulp fibers engaged betweenthe rotor vanes and the casing, thereby preventing the rollingandjamming of pulp between the casing and rotor; insuring the properpositioning of thehead late on the casing in a manner to position t ecrescent partition and sealing abutments accurately with respect tootherco-operating arts of the pump, insuring the removal of pulp from,and reventing its accumulation adjacent said a ut ments; continuouslyforcing the pulp toward the interior of the pump, and kee ing thebearings of the rotor and idler free rom any accumulation of pulp;washing the sealing faces of the idler teeth free of pulp before passinginto co-operative relationship with the'sealing abutments; flushing outthe interior of the pump preventing the passage of pulp to the rear ofthe rotor, thereby eliminating the loss of considerable pulp by way ofthe waste ,or drain pipe; relieving excessive friction at the hub of therotor, due to end thrust of therotor in the casing; and for improvingdevices of the character described in sundry details heretofore pointedout.

Obviously, the present invention is not limited to the preciseconstructionand arrangement shown and described, as the same may bevariously modified without departing from the spirit and ,scope of theinvention as set forth in the appended claims. -='Moreover, all thefeatures of th'einvention need not be used conjointly, as the same maybeused to advansub-eombin ations.

different combinations and v What I claim as my invention and desire tosecure by Letters Patent is:

1. A rota pump comprising a casing having inlet an outlet ports formedtherein, a rotor and idler pinionournalled in said casing, and meansassociated with said rotor and pinion for admitting water under pressurefor forcing the material to be operated upon toward the interior of thepump.

2. A rotary pump comprising a casing having inletrand outlet portsformed therein, a'rotor and idler pinion journalled in said ing inletrotorand idlerv'pinion journalled in said casing, and means formed onsaid rotor for forcin the material to be operated upon toward t einterior of the pump.

3. A rotary pump comprising a casing having inlet and outletports formedtherein, a rotor and idler pinion journalled in said casing, and meansformed in the bearing of said rotor for forcing the material tobe'operated up'on. toward the interior of the pump.

4. A rotary pump comprising a casing having inlet'and outlet'portsformed therein, a rotor and idler pinion journalled in said casing, andmeans formed in the bearing. of,

casing intermediate said ports and co-operable with each other in amanner to pass the material who operated upon from said inlet vto-saidoutlet port, and means formed in the bearings of sand rotor and pinionfor admitting water under pressure thereto. for preventing said materialfrom entering or accumulating' in said bearings.

7. A. rotary pump comprising a casing having an open end portion andinlet and outlet formed therein, a rotor having vanes g rmed thereon andan idler pinion journalled'in said casing intermediate said'ports', saidinion being mounted within and eccentri y withct to said rotor and havinteeth co-operab e with said vanes, a hea plate having water passages.formed therein secured to said casin for closing the .open

. end thereof, means or suplplyin water to said passages, a crescent-sape partit1on carried by said position varies in the vertical planethereof and-intermediate said ports, and a lurality of sealing abutmentsformed on sai, late and adapte to oo-operate with the end aces of saidrotor vanes an'd-said pinion for prov dlng a seal .tionship' with saidabutments.

head plate and adapted to be between said pinion and rotor within saidcasing intermediate said ports,

said pinion having a plurality of grooves formed in its end portionadjacent said head plate and extendin radially along the ends of theteeth of sai pinion, said grooves be-' ing adapted to communicate attheir ends with the interior of said casing and at their inner ends withsaid water passages at intervals in the course of rotation of saidpinion, said water passages being positioned with respect to saidsealing abutments in a manner to permit a stream of water to beprojected radially along the end of each pinion tooth just prior to thepassage of the sealing end or face of each tooth into co-operative rela8. A rotary pump comprising a casing having an open end portion andinlet and outlet ports formed therein, arotor having vanesformedthereon, and an idler. pinion jour-' nalled in said casing intermediatesaid ports, said inion being mounted within and eccentrica ly withrespect to said rotor and having teeth co-operable with said vanes, ahead' plate having water passages formed therein secured to said casingfor closing the open H end thereof, an idler pin mounted in said tendingtherethrough, means for supplying water under pressure to saidopening, aresilient bushing interposed between said pinion and idler pin andhaving a spiral groove adapted to communica e with said longitudi nalopening and saidw t'er passages for supplyin water to said passages, acrescentshape partition carried by said head plate and adapted to bepositioned between said.

vertical plane pinion and rotor vanes in the plate and having alongitudinal opening exj thereof and intermediate said ports, andaplurality of sealing abutments formed on said late and adapted to'co-operate with the ios end aces of said rotor vanes and said pinionfor roviding afseal within said casing inter .m iate said ports, saidpinion havin a plurality of grooves formed in its end portion adjacentsaid head plate and extending radi'-. ally along the ends of the teethof said-pinion, said grooves being adapted to communicate at their outerends with the interior of saidcasing and at their inner ends withsaidwater passages at intervals in the course of rotation of said pinion,said water assages being. positioned with respect to sai sealing astream of abutments in a manner to permit water to be pro ected radiallyalong the end of each pinion'tooth just prior to the passage of thesealing en'dor face of each tooth into co-operative relationship withsaid abutments. p I

' 9. A rotary pump comprising a casinghav ing an open end portion andinlet and outlet orts formed therein, a rotor and cooperatmg idlerpinion journalled in said casing, a head plate having water 1 passagesformed therein secured to said casing for closing mounted in said plateand having a longituform a distri utor chamber between said roing vanesformed thereon and an idler pinion journalled in said casing, and meansformed on said annular wall portionadjacent said ports and co-operablewith a peripheral edge portion of said vanes for severing pulp fibers'eng: iged between said vanes and the annular.

wall of said casing adjacent said ports.

14. A rotary pump comprising a casing the open end thereof, an idler pinrigidly dinal opening extending therethrough, said pin being adapted toextend inwardly from said pla e toward said rotor in a manner to tor andthe-end of said pin, a resilient bushing having a spiral groove formedthereinasecured to said pinion and rotatably mounted on said pin, saidgroove communicating at its\ in, and a rotor having vanes formed thereonopposite ends with said chamber and water and an idler pinion journalledin said casing, passages respectively, and means for-supplysaid pinionbeing adapted to co-operate with ing water'oosaidlon 'tudinal opening insaid the vanes f idl'ot l r passing the mapinto be conducted-tiroughsaid opening, disterial' to be operated upon-from said inlet tributorchamber and spiral groove to said. port to said outlet port, said rotorhaving Water passages. 1 r means formed thereon for forcing said ma- 10.A rotary pump comprising a casing terial toward the interior-of saidcasing and having an open-end portion and inlet and outpre n ing thepassage of said material. to let ports formed therein, a rotor and cotherear of said rotor and easing. operating idler pinion journalled insaidcase 1?. A rotary pump comprising a casing ing, a head plate havingwater passages havlnginlet and outlet ports formed therein, form d threin ur d t aid casing for a rotor having vanes formed thereon and anclosing the open end thereof, an idler in idler pinion journalled insaid casing,'said rigidly mounted in. aid late and having pinion beingadapted to co-opei'ate with the a longitudinal opening extending there-Vanesof said rotorfor passing the material through, said pin beingadapted to extend to be operated upon from said inlet port inwardly fromsaid plate toward said rotor to said outlet port, and means forsupplying in a manner to form a distributor chamber Water t0illle'infeliol' f S ng adjace t between said rotor and the end of saidpin, he rotor, said rotor having means form d a resilient bushing havinga spiral groove thereon for forcing the water from said supformedtherein secured to said pinion and p y-m ns w rd the interior of saidpump.

rotatably mounted on said pin, said groove 16. A rotary pump comprisi gCasing communicating at its opposite ends with said h v g inlet nd O etp rts formed therein,

chamberand water, assag'es respectively, said a rotor having vanesformed thereon and an lmon havlng ra ially extending grooves idler pinon ournalled in said casing, said ormed in one of its on portions, saidradlal plnlonbe ng adapted to eo-operate wlth the grooves being adaptedto communicate at Vanes'of said. rotor for passing the material theirinner ends with the water passages r p ra d pon from said inlet port toformed in said head and at) their outer ends sald Outlet port, and meansfor supplying ith th 'i t i f id i nd means water to the interior ofsaid casing adjacent for supplying water to said longitudinal etp lpllly of the rotor,

opening in sfiid pin to be conducted through fcommu'nicflting p al andannular grooves said opening, distributor chamber, spiral f m 11 the P py thereof fldjfwelifi groove, water passages and radially extend idWater Supply; means for forcing the ing grooves tothe interior of saidcasing. C from said pply means- W ,Said

11.A rotary pump comprising a casing van and having inlet and outletports formed therein, l-d pump. p arotor having vanes formed thereon.and an F A r tary pump comprising a easing idler pinion journalled in.aid asing, and havlng inlet and outlet ports formed therein, meansformedon said casing and co-operable a r0tor having vanes formed thereonand an with said vanes for producing a cutting or Idler pin onou-rnalled in said casing, said h i ti on l fib r gag d b pinion beingadapted to co-operate with the tween id vanes d in vanes of said rotorfor passing the material 12. A rotary pump comprising a casing t0 'beoperated upon from saidinlet port to having inlet and outlet portsformed therein, said outlet port, and a pipe for supplying having inletand outlet ports formed there said rotor having pinion and toward theinterior of 7 a rotor having vanes formed thereon, and W r t h n ri r fsaid casing adjacent an idler pinion journalled in said casing, theperiphery ofthe rotor, said rotor having and means formed on ,saidcasing adjacent longitudinally spaced apart annular grooves said portsand co-operable with said vanes 'for formed on the periphery thereofadjacent producingngcutting or shearing action on said pipe andnulargrooves, said rotor having formed also 13. A- rotary pumpcomprising a casing on its periphery a plurality of annularly having anannular wall portion and inlet spaced longitudlnally disposed groovescom and outlet ports formed therein, a rotor havmunicating at one oftheir end portions with V aspirally formed groove compulp "fibersengaged between saldvanes and municatmg at 1ts opposite ends with saidan- I casingfachacent said ports.

the annular groove adjacent said vanes and at their opposite endportions with the spaces between the vanes of said rotor. I

18. A rotary pump comprising a casing having inlet and outlet portsformed therein,

a shaft rotatably mounted in said casing, a

rotor secured to said shaft within said casing, a bushing having aspiral groove formed therein surrounding said shaft, and means forpassing a stream of water through said groove.

19. A rotary pump comprising a casing having inlet and outlet portsformed therein, a shaft rotatably mounted in said casing, a rotorsecured to said shaft within said casing, an annular distributor headsurrounding said shaft, a resilient bushing having a spiral grooveformed therein surrounding said shaft, said groove communicating at oneend with said distributor head and at its opposite end with the interiorof said casing, means for supplying Water to said head for passagethrough said groove to the interior-of said casing and means fordraining the water from said casing. p

20. A rotary pump comprising a casing having inlet and outlet portsformed therein,

, a shaft rotatably mounted insaid casing,- a

rotor secured to said shaft within said casing, an annular distributorhead surrounding said shaft,'a packing gland co-operable with ,a portionof said head for compressing packing material to prevent the escape ofwater from one side of said head, a resilient bushing having a spira'l'groove formed therein surrounding said shaft between said distributorhead and said casing, said groove communieating at one end with saiddistributor and at its opposite end with the interior of said casing,means for supplyin water to said head for passa e through said groove tocasing, and-meansfor draining the water from said casing.

21. A rotary pump comprising a casing having inlet and outlet portsformed therein, a bearing sleeve rigidly secured to said casing andhavin a radial groove formed in the inner end t ereof, a shaftrotatablyimounted in said sleeve, an annular .jdistributor head mountedin said sleeve and surrounding said shaft, a? resilient bushing having aspiral groove surrounding said shaft withi'n said sleeve, said spiralgroove communicating at one of its ends with said distributor head andat its opposite end with said radial groove,

' a water inlet port formed in said sleeve and communicating with saiddistributor head, a

1 water supply pipe .communicating'with said.

water inlet port,'and means co-operable with said distributor head. forpreventing the escape of water from one sid thereof.

22-. A rotary pump comprising a casing having inlet and outlet portsformed therein, 'a rgtor and idler pinion journalled in said cas ngintermediate said ports, a sealing abutment co-operable with said rotorand pinion for providing a seal within said casi ing intermediate saidports, and means for projecting water into the interior of said ing forclosing the open end thereof, sealing abutments formed on said plate andco-operable with said rotor and pinion for providing a seal within saidcasing intermediate said ports, and means for projecting a spray ofwaterinto the interior of saidcasing adjacent the edges of saidabutments.

g 24. A rotary pump comprising a casing having an open end portion andinlet and outlet ports formedtherein, a'rotor and idler pinionjournalledi in said casing intermediate said ports, a headplate securedto said ms ing forclosing the open ifd there0f,sea ling i abutmentsformed on said plate and co-opering a seal within said casingintermediate said ports, said plate having a plurality of of waterpockets formed in the body portion thereof and a plurality of sprayholes (30111 municating with the interior of said casingand with saidwater pockets, and means for supplying water tosaid pockets.

25. A rotary pump comprising a casing ing a utments formed on said plateand cooperable with saidrotor and pinionfor providing-"a seal withinsaid casing intermediate said ports, said plate having a plurality ofsubstantially radially disposed water pockets formed in the body portionthereof and a plurality of spray holes adjacent the edges of saidabutments, said holes communicating with the interior of said casing andwith each able with said rotor and pinion for provid-' for closing theopen end thereof, seal-' of said water pockets, and a pipe-for supply--I ing water to said pockets. I

26. A rotary pump comprising a' casin having an open end portion andinlet an outlet ports formed therein, a rotor and idler pinionjournalled in said casing intermediate said ports, a head plate securedto said casing for closing theopen end thereof, sealing abutments formedon said plate and copper-able withv said rotor and pinion for providinga of said abutments, said series of spray ho es communicating with theinterior of. said c'assealwithigi said caslng intermediate said: ports,said plate having at-plurality of subv ing and respectively with each ofsaid water pockets, and said pockets.-

27. A rotary pump comprising a casing having a rear wall port-ion, arotor journalled in said casing in a manner to provide a space orchamber between said rotor and rear wall portion, and means for forcingwater into said chamber to create a pressure therein tending to separatesaid rotor from said wall portion for counter-balancing pressure exertedon the opposite side of said rotor.

28. A rotary pump comprising a casing having a rear wall portion, ashaft rotatably mounted in said casing. a rotor mounted on said shaft,said rotor being positioned in the casing in a manner to provide a spaceor pipes for supplying water to chamber between said rotor and rear wallportion, and means associated with the bearing of said rotor shaft forforcing Water into said chamber to create a pressure therein tending toseparate said rotor from said wall portion for counter-balancingpressure exerted on the opposite side of said rotor;

2Q. A rotary pump comprising a casing having a rear wall portlon, ashaft rotatably mounted in said casing, a rotor mounted on said shaft,said rotor being positioned in the casing in a manner to provide a spaceor chamber between said rotor and rear wall portion, and meansassociated with .the bearin said casing in a manner to provide a spaceor chamber between said rotor and rear wall portion, said wallportionhaving a plurality of openings formed therein, means for closingsaid openings, and means for forcing water into said chamber to create apressure therein tending to separate'said rotor from said rear wallportion.

31'. A rotary pump comprising a casing having an open end portion andinlet and outlet ports formed therein, a rotor mountedto rotate in saidcasing, a head plate having water passages formed therein secured tosaid casing for closing the open end thereof, an idler pinion having acentral opening formed therein and having an idler plate positioned inone end of said opening, an idler pin mounted on-said head plate andadapted to extend into the opening in said pinion in a manner to form adistributor chamber within said pinion and between said idler plate andthe end of said pin, a resilient bushing having a spiral groove formedtherein secured to said pinion and rotatably mounted on said pin, saidgroove communicating at its opposite ends with said chamber and waterpassages respeetivel y, and means for supplying Water to saidlongitudinal openingin said pin to be conducted through saidopening,distributor chamber and spiral groove to said water passages.

32. A rotary pump compris nga casing having open end portion and inletand outlet ports formed therein, a head plate secured to said casing forclosing the open end thereof, a rotor and idler pinion journaled'torotate in saidcasing intermediate said ports, means formed-in saidcasing and plate for admitting water under pressure to 'said casing forforcing the material to be operated upon toward the interior of the pumpduring its passage therethrough and for flushing out the interior ofsaid casing.

In testimony whereof I have signed my name to this specification on this16th day of March, A. D. 1927.

AMOS VERNER JENSEN.

